公开(公告)号：US3725118A

公开(公告)日：1973-04-03

申请号：US3725118D

申请日：1971-06-23

Applicant: IBM

Inventor： WOOSLEY K ,  FULLER S ,  MUNZEL H

IPC: G03G9/113 ,  G03G13/08 ,  B32B15/08

CPC classification number: G03G9/1133 ,  Y10T428/2991

Abstract: AN ELECTROPHOTOGRAPHIC DEVELOPMENT CARRIER COMPRISING CORE PARTICLES COATED WITH A CARBOXYLATED POLYETHYLENE IONOMER. WHEN UTILIZED WITH APPROPRIATE ELECTROSCOPIC TONER MATERIALS, AND CARRIER, WITH IS COATED WITH A CARBOXYLATED POLYETHYLENE IONOMER IS EFFECTIVE IN PRODUCING A DESIRED POLARITY AND MAGNITUDE OF THE TRIBOELECTRIC CHARGE ON THE TONER PARTICLES. CONTROL OF THE POLARITY AND MAGNITUDE OF THE TRIBOELECTRIC CHARGE CHARACTERISTIC OF THE CARRIER, WHICH HAS ITS PARTICLES COATED WITH THE CARBOXYLATED POLYETHYLENE IONOMER IS OBTAINED BY CONTROLLING THE CURING TEMPERATURE OF THE CARBOXYLATED POLYETHLENE IONOMER.

公开(公告)号：BR7204133D0

公开(公告)日：1973-05-31

申请号：BR413372

申请日：1972-06-23

Applicant: IBM

Inventor： FULLER JR S ,  WOOSLEY K ,  MUNZEL H

IPC: G03G9/113 ,  G03G13/08

Abstract: 1389744 Coated particles for electrophotographic developer INTERNATIONAL BUSINESS MACHINES CORP 12 June 1972 [23 June 1971] 27302/72 Heading B2E An electrophotographic developer includes carrier particles and toner particles, the carrier particles each having an interior core portion and a surface layer which comprises at least a major portion of carboxylated polyethylene ionomer. The core may be of sand, glass, metal e.g. iron or steel, magnetic oxides and alloys, e.g. copper-nickel-iron. The coating may be applied to the particulate core material by dipping, spraying, tumbling the core material with a coating solution in a barrel, or by using a fluidised bed. The core material may be pre-treated with a primer, e.g. polyvinyl butyral resin, vinyl chloride terpolymer, polymethyl methacrylate. Other pre-treatments include cleaning, pickling and etching. Pigments and other polymers may be added to the ionomer coating to modify the triboelectric behaviour of the coating.